JPWO2016143718A1 - Wireless communication system, wireless communication method, wireless LAN base station apparatus, and wireless LAN terminal apparatus - Google Patents

Abstract

In a wireless communication system in which an AP and a plurality of STAs are connected and different radio frames addressed to the plurality of STAs are simultaneously transmitted from the AP by FDMA, the AP generates a control frame having information on frequency resources allocated to each STA. A control frame transmitting means for transmitting this control frame in a primary channel commonly used by each STA; and a radio frame transmitting means for simultaneously transmitting a radio frame addressed to each STA using a frequency resource allocated to each STA, The STA includes frequency resource selection / reception means for receiving a control frame on the primary channel and receiving a radio frame addressed to the own station using the frequency resource notified by the control frame.

Description

  The present invention uses a frequency division multiple access (FDMA) system to simultaneously transmit wireless frames addressed to a plurality of wireless LAN terminal devices from a wireless LAN base station device, a wireless communication method, and a wireless communication device. The present invention relates to a LAN base station device and a wireless LAN terminal device. In this specification, the wireless LAN terminal device is abbreviated as STA, and the wireless LAN base station device is abbreviated as AP.

  In the IEEE802.11a standard in a wireless LAN system, communication is performed using a frequency band of 20 MHz per channel. In the IEEE802.11n and later standards, a channel bonding function for performing communication by bundling a plurality of channels is defined. According to the IEEE802.11n standard, communication can be performed using a 40 MHz frequency band by bundling up to two channels according to the channel usage. According to the IEEE802.11ac standard, communication can be performed using a frequency band of 160 MHz by bundling up to 8 channels. For example, a primary channel is set as shown in FIG. 21, and other bundled channels are set as secondary channels. Here, an example is shown in which CH1 is a primary channel and CH2 to CH8 are secondary channels. The start of transmission / reception in the AP and STA is determined by carrier sensing the signal on the primary channel. Whether or not the secondary channel can be used is determined by whether or not the channel is being used by another wireless station.

  Also, in the IEEE802.11ac standard, MU-MIMO (Multi-user multiple input multiple output) to which a space division multiple access scheme is applied is adopted to improve the efficiency of downlink communication from the AP to the STA. It is possible to transmit different radio frames addressed to STAs simultaneously. Further, as shown in Non-Patent Documents 1 and 2, in the wireless LAN system, in order to improve the access efficiency to a large number of STAs, different wireless frames addressed to a plurality of STAs from the AP are simultaneously transmitted by FDMA. Is being considered.

  However, in the IEEE802.11n standard or IEEE802.11ac standard STA, since it is necessary to always transmit and receive using the primary channel, simultaneous transmission by FDMA is not assumed. These STAs are called conventional standard STAs. On the other hand, an STA for which simultaneous transmission by FDMA is assumed is called a new standard STA. Here, as shown in FIG. 1, when the conventional standard STA and the new standard STA1 to the new standard STA4 are connected to the AP, the FDMA depends on the new standard STA or a combination of the conventional standard STA and the new standard STA. It is possible to perform simultaneous transmission. However, since the conventional standard STA always uses the primary channel, the new standard STA uses a channel other than the primary channel.

FIG. 22 shows an example of simultaneous transmission from the AP to the conventional standard STA and the new standard STA by FDMA. This example is shown in Patent Document 1. The new standard STA is expressed as N (New) -STA, and the conventional standard STA is expressed as L (Legacy) -STA.
In FIG. 22, each STA connected to the AP corresponds to the following standard. L-STA1 (11a) supports only the primary channel CH1 in accordance with the IEEE802.11a standard. L-STA2 (11n) supports primary channel CH1 and secondary channel CH2 in conformity with the IEEE802.11n standard. L-STA3 (11ac) supports primary channel CH1 and secondary channels CH2 to CH4 in conformity with the IEEE802.11ac standard. However, since these standards always use the primary channel, simultaneous transmission by FDMA is not assumed. However, in the IEEE802.11ac standard, simultaneous transmission using MU-MIMO is possible. On the other hand, N-STA (11ax) conforms to IEEE802.11ax which is a new standard, and simultaneous transmission by FDMA is assumed in addition to the function of IEEE802.11ac.

  With the above configuration, simultaneous transmission by FDMA is not possible between L-STAs, but simultaneous transmission by FDMA is possible if the combination is L-STA and N-STA. However, when transmitting to N-STA, channels other than the primary channel CH1 are used. In the example shown in FIG. 22, the transmission data addressed to L-STA1 (11a) and N-STA (11ax) is generated in the AP, and a procedure for performing simultaneous transmission is shown.

  The AP transmits an RTS frame to all N-STAs (11ax) using all channels CH1 to CH4. L-STA1 (11a), L-STA2 (11n), and L-STA3 (11ac) receive the RTS frame that is not addressed to the local station on primary channel CH1, and set the NAV for the period indicated in the RTS frame to primary channel CH1. To do.

  The N-STA (11ax) has a configuration capable of carrier sense and demodulation in parallel for each channel CH1 to CH4. When the RTS frame for each channel is demodulated and is an RTS frame addressed to the own station, the N-STA (11ax) A CTS frame is returned to the AP using all or part of CH1 to CH4.

  When the AP receives the CTS frame from the N-STA (11ax), the AP simultaneously transmits data frames to the L-STA1 (11a) and the N-STA (11ax) by FDMA. At this time, the AP transmits to the L-STA1 (11a) using only the primary channel CH1, and the channel CH2 of the remaining channels CH2 to CH4 here is transmitted to the N-STA (11ax) as a guard band. And transmit using channels CH3 and CH4.

  When the L-STA1 (11a) and the N-STA (11ax) each correctly receive the data frame addressed to itself, the L-STA1 (11a) and the N-STA (11ax) return a block ACK (hereinafter referred to as “BA”) on the received channel.

International Publication No. 2014/014084

“Proposed Specification Framework for TGax,” Robert Stacey et al., Doc.:IEEE 802.11-14 / 1453r2, 5 November 2014 “Simultaneous Transmission Technologies for HEW,” Koichi Ishihara et al., Doc.:IEEE 11-13 / 1395r2, 12 November 2013 The LAN / MAN Standards Committee, “IEEE Std 802.11TM-2012 IEEE Standard for Information Technology-Telecommunications and information exchange between systems-Local and metropolitan area networks Specificrequirements Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications "IEEE, 6 February 2012

  In the wireless LAN system, when performing simultaneous transmission by FDMA in order to improve frequency utilization efficiency, not only N-STAs but also L-STA (11a / 11n / 11ac) and N-STA ( It is effective to perform simultaneous transmission in combination with 11ax). When simultaneous transmission is performed for the L-STA and the N-STA, a channel other than the primary channel is allocated to the N-STA, but a method for notifying the N-STA of the allocated channel is a problem. .

  In patent document 1, N-STA assumes the structure which can receive the radio | wireless frame of each channel CH1-CH4 containing a primary channel in parallel, Even if there is no prior notification, the radio | wireless frame using a secondary channel is assumed. Reception is possible. That is, L-STA and N-STA are configured to be able to receive radio frames transmitted simultaneously by FDMA on their respective channels.

  However, in the case where the N-STA is configured to receive a radio frame of the primary channel, as in the case of the L-STA, the frequency used for simultaneous transmission to the radio frame for the L-STA transmitted on the primary channel. Does not contain information indicating resources and destinations. Therefore, even if the N-STA receives the radio frame of the primary channel, it cannot receive the radio frame addressed to the own station because there is no information on the frequency resource used by the own station. That is, if the N-STA does not receive a radio frame other than the primary channel without prior notification, simultaneous transmission using frequency resources other than the primary channel cannot be performed. In N-STA, not only a secondary channel of 20 MHz band unit but also allocation of arbitrary frequency resources other than the primary channel and simultaneous transmission are being studied.

  The present invention enables N-STAs to acquire information on frequency resources used for simultaneous transmission directly or indirectly from a radio frame of a primary channel, and FDMA for a plurality of N-STAs or a combination of L-STAs and N-STAs. It is an object of the present invention to provide a wireless communication system, a wireless communication method, a wireless LAN base station apparatus, and a wireless LAN terminal apparatus that enable simultaneous transmission by the wireless communication.

  A first invention is a radio communication system in which an AP and a plurality of STAs are connected, and a radio frame addressed to each STA is simultaneously transmitted from the AP by a frequency division multiple access method. In the radio communication system, the AP transmits frequency resources allocated to each STA. Control frame transmission means for generating a control frame having information and transmitting this control frame on a primary channel shared by each STA, and a radio frame addressed to each STA simultaneously using frequency resources allocated to each STA The STA includes a radio frame transmitting unit, and the STA includes a frequency resource selection receiving unit that receives a control frame on the primary channel and receives a radio frame addressed to the own station using the frequency resource notified by the control frame.

  A second invention is a wireless communication system in which an AP and a plurality of STAs are connected, and a radio frame addressed to each STA is simultaneously transmitted from the AP by a frequency division multiple access method. In the AP, each STA has a high-efficiency preamble of a radio frame. Control frame transmission means for generating a control frame having subchannel information for receiving a part, and transmitting a control frame on a primary channel commonly used by each STA, and information on frequency resources allocated to each STA. Radio frame transmission means configured to simultaneously transmit radio frames addressed to each STA using frequency resources assigned to each STA and set in the high-efficiency preamble unit. The STA receives the control frame on the primary channel, and receives the control frame. High efficiency of radio frame by switching to the subchannel notified by Demodulating the preamble section, and a frequency resource selection receiving means for receiving a radio frame addressed to the own station at the notified frequency resources by the high efficiency preamble section.

  A third invention is a wireless communication system in which an AP and a plurality of STAs are connected, and a wireless frame addressed to each STA is simultaneously transmitted from the AP by a frequency division multiple access method. In the wireless communication system, the AP is a primary channel shared by each STA. An information notification subcarrier different from the prescribed subcarrier is added to the PHY preamble portion of the radio frame, and each STA receives a high-efficiency preamble portion of the radio frame using this information notification subcarrier. Subcarrier information notification means for reporting subchannel information and frequency resource information allocated to each STA are set in the high-efficiency preamble section, and radio frames addressed to each STA are simultaneously transmitted using the frequency resources allocated to each STA. Radio frame transmitting means for transmitting, and the STA is a primary channel. Detects the subcarrier for information notification in the PHY preamble portion of the line frame, switches to the subchannel notified by the subcarrier for information notification, demodulates the high-efficiency preamble portion of the radio frame, and uses this high-efficiency preamble portion Frequency resource selection / reception means is provided for receiving a radio frame addressed to the own station using the notified frequency resource.

  In the wireless communication system of the third invention, the PHY preamble section is configured by conventional standards L-STF, L-LTF, and L-SIG, and an information notification subcarrier is added to at least one of the fields. .

  In the radio communication system according to the second or third aspect, the high-efficiency preamble portion of the radio frame is simultaneously transmitted by frequency multiplexing or spatial multiplexing with the first high-efficiency preamble used for notification of a band in which each STA demodulates the radio frame. A second high-efficiency preamble used for notification of the allocation of frequency resources allocated to each STA to be transmitted, and the second high-efficiency preamble is a sub-channel bandwidth or a full bandwidth used for radio frame transmission. Sent.

  A fourth aspect of the invention is a wireless communication method in which an AP and a plurality of STAs are connected, and a wireless frame addressed to each STA is simultaneously transmitted from the AP by a frequency division multiple access method. In the wireless communication method, the AP transmits frequency resources allocated to each STA. A control frame having information is generated, and a control frame transmission step of transmitting this control frame on a primary channel shared by each STA, and a radio frame addressed to each STA are simultaneously transmitted using frequency resources allocated to each STA. The STA has a frequency resource selection reception step of receiving a control frame on the primary channel and receiving a radio frame addressed to the own station using the frequency resource notified by the control frame.

  According to a fifth aspect of the present invention, there is provided a wireless communication method in which an AP and a plurality of STAs are connected, and a wireless frame addressed to each STA is simultaneously transmitted from the AP by a frequency division multiple access method. The AP includes a high-efficiency preamble of each wireless frame. A control frame transmission step for generating a control frame having subchannel information for receiving a part, transmitting a control frame on a primary channel shared by each STA, and information on frequency resources allocated to each STA. A radio frame transmission step for simultaneously transmitting a radio frame addressed to each STA using frequency resources set in the high-efficiency preamble section and allocated to each STA, and the STA receives a control frame on the primary channel and performs this control. Switch to the subchannel notified by the frame and Demodulating the rate preamble portion has a frequency resource selection receiving step of receiving radio frames addressed to the own station at the notified frequency resources by the high efficiency preamble section.

  A sixth invention is a wireless communication method in which an AP and a plurality of STAs are connected, and a wireless frame addressed to each STA is simultaneously transmitted from the AP by a frequency division multiple access method. In the wireless communication method, the AP uses a primary channel shared by each STA An information notification subcarrier different from the prescribed subcarrier is added to the PHY preamble portion of the radio frame, and each STA receives a high-efficiency preamble portion of the radio frame using this information notification subcarrier. A subcarrier information notifying step for notifying subchannel information and frequency resource information allocated to each STA are set in the high-efficiency preamble section, and radio frames addressed to each STA are simultaneously transmitted using the frequency resources allocated to each STA. A radio frame transmission step for transmitting, wherein the STA has a primary channel; Detects a subcarrier for information notification in the PHY preamble portion of the radio frame, switches to the subchannel notified by the subcarrier for information notification, demodulates the high-efficiency preamble portion of the radio frame, and this high-efficiency preamble portion There is a frequency resource selection receiving step of receiving a radio frame addressed to the own station by using the frequency resource notified by.

  In the radio communication method according to the sixth aspect of the invention, the PHY preamble part is composed of conventional L-STF, L-LTF, and L-SIG, and an information notification subcarrier is added to at least one of the fields. .

  In the radio communication method of the fifth or sixth invention, the high-efficiency preamble portion of the radio frame is simultaneously transmitted by frequency multiplexing or spatial multiplexing with the first high-efficiency preamble used for notification of a band in which each STA demodulates the radio frame. A second high-efficiency preamble used for notification of the allocation of frequency resources allocated to each STA to be transmitted, and the second high-efficiency preamble is a sub-channel bandwidth or a full bandwidth used for radio frame transmission. Sent.

  According to a seventh aspect of the present invention, in the AP of a wireless communication system in which an AP and a plurality of STAs are connected and a radio frame addressed to each STA is simultaneously transmitted from the AP by a frequency division multiple access method, information on frequency resources respectively allocated to each STA A control frame transmitting means for generating a control frame having the same and transmitting the control frame on a primary channel commonly used by each STA, and a radio for simultaneously transmitting a radio frame addressed to each STA using a frequency resource allocated to each STA. Frame transmitting means.

  In an AP of a wireless communication system in which an AP and a plurality of STAs are connected and a radio frame addressed to each STA is simultaneously transmitted from the AP by a frequency division multiple access method, each STA has a high-efficiency preamble portion of the radio frame. Control frame transmitting means for generating a control frame having sub-channel information for receiving and transmitting a control frame on a primary channel shared by each STA, and information on frequency resources allocated to each STA. Radio frame transmission means configured to simultaneously transmit radio frames addressed to each STA using frequency resources assigned to each STA and set in the efficiency preamble section.

  According to a ninth aspect of the present invention, in an AP of a radio communication system in which an AP and a plurality of STAs are connected and a radio frame addressed to each STA is simultaneously transmitted from the AP by a frequency division multiple access method, a primary channel shared by each STA is used. A subcarrier for information notification different from the specified subcarrier is added to the PHY preamble portion of the radio frame, and each STA receives a high-efficiency preamble portion of the radio frame using this information notification subcarrier. Subcarrier information notification means for reporting channel information and frequency resource information allocated to each STA are set in the high-efficiency preamble section, and radio frames addressed to each STA are simultaneously transmitted using the frequency resources allocated to each STA. Wireless frame transmitting means.

  In a tenth aspect of the invention, each wireless LAN terminal apparatus is commonly used in a STA of a wireless communication system in which an AP and a plurality of STAs are connected and a wireless frame addressed to each STA is simultaneously transmitted from the AP by a frequency division multiple access method. Frequency resource selection / reception means is provided for receiving a control frame transmitted by the AP on the primary channel and receiving a radio frame addressed to the own station using the frequency resource notified by the control frame.

  In an STA of a wireless communication system in which an AP and a plurality of STAs are connected, and a wireless frame addressed to each STA is simultaneously transmitted by the frequency division multiple access method from the AP, each wireless LAN terminal device uses in common. It receives a control frame transmitted by the AP on the primary channel, switches to the sub-channel notified by this control frame, demodulates the high-efficiency preamble portion of the radio frame, and uses its frequency resource notified by this high-efficiency preamble portion. Frequency resource selection / reception means for receiving the addressed radio frame is provided.

  In a twelfth aspect of the invention, each wireless LAN terminal device is commonly used in an STA of a wireless communication system in which an AP and a plurality of STAs are connected and a wireless frame addressed to each STA is simultaneously transmitted from the AP by a frequency division multiple access method. The subcarrier for information notification of the PHY preamble portion of the radio frame transmitted by the AP on the primary channel is detected, and the subchannel notified by the subcarrier for information notification is switched to demodulate the high-efficiency preamble portion of the radio frame. And a frequency resource selection / reception means for receiving a radio frame addressed to the own station using the frequency resource notified by the high-efficiency preamble section.

  In the present invention, a frequency resource of a radio frame that is simultaneously transmitted by FDMA to a plurality of STAs is set in the AP, and the frequency resource is notified to each STA using a control frame of a primary channel. Each STA can receive a radio frame addressed to itself using the frequency resource notified by the control frame of the primary channel.

  In the present invention, in an AP, a frequency resource of a radio frame that is simultaneously transmitted to a plurality of STAs by FDMA is set, and a high-efficiency preamble part that notifies information on the frequency resource using a control frame of a primary channel is received. Of each sub-channel is notified to each STA. Each STA can demodulate the high-efficiency preamble portion on the subchannel notified by the control frame of the primary channel, and can receive a radio frame addressed to itself by using the obtained frequency resource.

  The present invention sets frequency resources of radio frames simultaneously transmitted by FDMA to a plurality of STAs at an AP, and uses the information notification subcarrier newly provided in the PHY preamble portion of the radio frame of the primary channel. Each STA is notified of subchannel information for receiving a high-efficiency preamble portion that notifies resource information. Each STA can demodulate the high-efficiency preamble portion on the subchannel notified by the primary channel information notification subcarrier, and can receive a radio frame addressed to itself by using the obtained frequency resource.

  Thus, in each STA, the frequency resource for receiving the data frame addressed to the local station is found by monitoring the subcarrier for information notification in the control frame of the primary channel or the PHY preamble portion of the radio frame. By switching to the channel indicated by the frequency resource, a radio frame addressed to the own station can be received.

It is a figure which shows the structural example of the radio | wireless communications system of this invention. It is a figure which shows the structural example of the new specification STA. It is a figure which shows Example 1-1 of simultaneous transmission control in the radio | wireless communications system of this invention. It is a figure which shows Example 1-2 of simultaneous transmission control in the radio | wireless communications system of this invention. It is a figure which shows Example 1-3 of the simultaneous transmission control in the radio | wireless communications system of this invention. It is a figure which shows Example 1-4 of simultaneous transmission control in the radio | wireless communications system of this invention. It is a figure which shows Example 1-5 of simultaneous transmission control in the radio | wireless communications system of this invention. It is a figure which shows the frame format example of a multichannel notification frame (MC). It is a figure which shows Example 2-1 of simultaneous transmission control in the radio | wireless communications system of this invention. FIG. 10 is a diagram illustrating an example of subcarrier arrangement of L-LTF in the second embodiment. It is a figure which shows Example 2-2 of simultaneous transmission control in the radio | wireless communications system of this invention. It is a figure which shows Example 2-3 of simultaneous transmission control in the radio | wireless communications system of this invention. It is a figure which shows Example 2-4 of simultaneous transmission control in the radio | wireless communications system of this invention. It is a figure which shows Example 2-5 of simultaneous transmission control in the radio | wireless communications system of this invention. It is a figure which shows Example 2-6 of simultaneous transmission control in the radio | wireless communications system of this invention. It is a figure which shows Example 2-7 of simultaneous transmission control in the radio | wireless communications system of this invention. It is a figure which shows BA transmission procedure example 1 in the radio | wireless communications system of this invention. It is a figure which shows BA transmission procedure example 2 in the radio | wireless communications system of this invention. It is a figure which shows BA transmission procedure example 3 in the radio | wireless communications system of this invention. It is a figure which shows BA transmission procedure example 4 in the radio | wireless communications system of this invention. It is a figure which shows an example of a primary channel and a secondary channel. It is a figure which shows the example which performs simultaneous transmission from AP to several STA by FDMA.

FIG. 1 shows a configuration example of a wireless communication system of the present invention.
In FIG. 1, a conventional standard STA, for example, IEEE802.11a, 11n, and 11ac, which is a conventional standard, and a new standard STA1 to a new standard STA4, which is a new standard, IEEE802.11ax, are connected to an AP. In the following description of the embodiment, it is assumed that simultaneous transmission is performed from AP to FDMA with respect to new standard STAs or a combination of conventional standard STAs and new standard STAs.

FIG. 2 shows a configuration example of the new standard STA.
In FIG. 2, the new standard STA is necessary for each control, a radio communication unit 11 that transmits and receives radio frames, a control unit 12 that performs overall control of radio frame transmission / reception control including reception processing of radio frames transmitted simultaneously. An information management unit 13 for managing information and a channel switching unit 14 are configured. The channel switching unit 14 is simultaneously transmitted via a primary channel that receives a radio frame common to the conventional standard STA and a channel that receives a simultaneously transmitted radio frame, or a subchannel that receives a high-efficiency preamble unit described later. Switch to the channel that receives the received radio frame.

Example 1
FIG. 3 shows Example 1-1 of simultaneous transmission control in the wireless communication system of the present invention. The new standard STA is denoted as N-STA, and the conventional standard STA is denoted as L-STA.
In FIG. 3, it is assumed that the AP performs simultaneous transmission by FDMA with the L-STA of the conventional standards IEEE802.11a, 11n, and 11ac and the N-STA1 and N-STA2 of the new standard IEEE802.11ax as destinations. Prior to simultaneous transmission of data frames by FDMA, the AP uses a primary channel common to L-STA and N-STA, and uses a multi-channel notification frame (hereinafter, referred to as a frame format that can be demodulated by N-STA1 and N-STA2). "MC").

  The AP notifies N-STA1 and N-STA2 of frequency resources for receiving subsequent data frames through the MC. For example, since the primary channel is always used for data frame transmission in L-STA, the frequency resources notified by MC of N-STA1 and N-STA2 are bands other than the primary channel and the secondary channel used in L-STA. . The frequency resource used for transmitting the data frames of N-STA1 and N-STA2 may designate channels of 20, 40, 80, and 160 MHz combined with subchannels in units of 20 MHz. It may not be in units of 20 MHz. Details of the frame format of the data frames of N-STA1 and N-STA2 will be described in Example 2 described later.

  Further, the MC transmitted using the primary channel may be one that can be received by the L-STA. The frequency resources used by N-STA1 and N-STA2 are not necessary for L-STA. For example, if the information of the duration field can be demodulated, the period required for simultaneous transmission set therein is set as a transmission prohibition period NAV. It may be set.

  In addition, as shown in FIG. 4, the MC transmitted using the primary channel may be duplicated (arranged) on the secondary channel and transmitted to prevent channel interruption as a wideband radio frame. However, N-STA1 and N-STA2 do not demodulate MC on the secondary channel.

  Further, as shown in FIGS. 3 and 4, a channel adjacent to the primary channel may be opened as a guard band. The guard band is a band that avoids interference between frames transmitted by frequency multiplexing, and the bandwidth may be changed according to the frame error occurrence rate exerted by the amount of interference. In addition, the guard band may be secured over the entire frame time length, but the data portion other than the data portion is not essential. For example, it may not be provided in the PHY preamble portion. Thereby, when L-STA and N-STA receive the MC and the data frame of the primary channel with narrow band filter characteristics, it is possible to suppress the influence of the sneak interference from the adjacent channel.

  Further, after the AP notifies the N-STA1 and N-STA2 of information on frequency resources used for simultaneous transmission by the MC, as shown in FIG. 5, the RTS / CTS frame is used using the primary channel as a countermeasure for hidden terminals. May be exchanged. For example, by setting a time including the RTS / CTS frame exchange time as a timeout time until simultaneous transmission is performed by channel information indicated by MC, there is no data frame transmitted immediately after MC transmission. Can also notify the channel arrangement.

  When the L-STA, N-STA1, and N-STA2 correctly receive the data frame addressed to the local station on the assigned subchannel, the L-STA returns the BA on the received primary channel. The BA returned by the N-STA will be described separately with reference to FIGS.

  FIG. 5 shows an example in which the AP exchanges the RTS / CTS frame following the MC that notifies the frequency resource information used by the N-STA1 and N-STA2. Here, instead of the MC and the RTS / CTS frame, the exchange of the MU-RTS frame and the CTS frame having the MC function will be described with reference to FIG. 6 and FIG.

  In FIG. 6, the AP transmits a MU-RTS frame using a primary channel common to L-STA and N-STA before transmitting a data frame simultaneously by FDMA. The MU-RTS frame notifies the L-STA, N-STA1, and N-STA2 of information on frequency resources used by each N-STA using the primary channel and has an RTS frame function.

  Since L-STA cannot recognize the MU-RTS frame, it is ignored. N-STA1 and N-STA2 transmit CTS frames on the primary channel and the notified subchannel, respectively. That is, the CTS frame is transmitted on all subchannels scheduled to be used in L-STA, N-STA1, and N-STA2. When the L-STA, N-STA1, and N-STA2 correctly receive the data frame addressed to the local station on the assigned subchannel, the L-STA returns the BA on the received primary channel. The BA returned by the N-STA will be described separately with reference to FIGS.

Also, as shown in FIG. 4, the MU-RTS frame transmitted using the primary channel is duplicated and transmitted on the secondary channel to prevent channel interruption as a wideband radio frame. Good.
Further, as shown in FIG. 7, N-STA1 and N-STA2 may each transmit a CTS frame on a subchannel notified from the AP in a MU-RTS frame.

FIG. 8 shows a frame format example of the multi-channel notification frame (MC). The same applies to the MU-RTS frame. For example, a trigger frame format proposed as a new standard IEEE802.11ax can be used.
In FIG. 8, MC may be a frame format that can be demodulated by N-STA, and is similar to a normal MAC frame, such as a frame control field, duration field, RA (destination address) field, TA (source address) field, It consists of a frame body field and an FCS field.

In the frame body field, N-STAs and frequency resources that are simultaneously transmitted by FDMA are stored in association with each other.
When the type and subtype of this frame are indicated in advance in the frame control field, RA may be set to the address of the AP that is the transmission source, and TA may be omitted.

  By setting a broadcast bit string in RA, it is possible to collectively notify frequency resources corresponding to a plurality of N-STAs that are simultaneously transmitted by FDMA. Also, if MAC addresses or AIDs (Association IDs) of a plurality of N-STAs simultaneously transmitted by FDMA are set in RA, the frequency resource information corresponding to each N-STA is notified together with the frequency resource information of the frame body field. it can. Similarly, frequency resource information corresponding to each N-STA can be notified even if a group ID (GID) indicating a plurality of N-STA groups simultaneously transmitted by FDMA is set in the RA.

  3 to 5, it is desirable that the frame time lengths of the data frames transmitted at the same time are aligned so as not to be affected by channel interruption or the like. To align the frame time length, align the data length of the primary channel data frame as the maximum length, align the data frame with the maximum frame time length, and adjust the total data frame to the shortest frame time that can be unified. There is a way to align the length. Adjustment of the frame time length can be done by padding, changing the modulation method, or the like.

(Example 2)
FIG. 9 shows Example 2-1 of simultaneous transmission control in the wireless communication system of the present invention.
Here, the frame formats of radio frames 50 and 51 transmitted simultaneously by FDMA from an AP to an L-STA and a plurality of N-STAs are shown.

  In FIG. 9, a radio frame 50 is a frame transmitted to the L-STA using a primary channel having a 20 MHz bandwidth. The radio frame 51 is a frame transmitted to a plurality of N-STAs using frequency resources other than the channel assigned to the L-STA. Here, a frame format for N-STA, in which 20 MHz bandwidth sub-channels are transmitted by four 80 MHz bandwidth channels, is shown.

  L-STF, L-LTF, and L-SIG of the PHY preamble portion of the radio frame 50 for L-STA are common to L-STA and N-STA defined in the IEEE802.11a standard. Demodulation is possible in STA and N-STA. On the other hand, L-STF, L-LTF, and L-SIG of the PHY preamble portion of the radio frame 51 for N-STA are the same as the PHY preamble portion of the radio frame 50 for L-STA and have a 20 MHz bandwidth. Although it is transmitted on the subchannel, it is not demodulated by the N-STA that matches the primary channel at this point.

  A feature of the second embodiment is that a subcarrier for information notification is newly provided in a part of L-STF, L-LTF, and L-SIG constituting the PHY preamble portion of the radio frame 50 of the primary channel. FIG. 9 shows an example in which a subcarrier for information notification is newly provided in the L-LTF. The radio frame 50 uses this information notification subcarrier to notify a subchannel (hereinafter referred to as “temporary primary channel”) used for notification of channel information allocated for N-STA. FIG. 10 shows an example in which two subcarriers for information notification are arranged outside the normal subcarrier arrangement of L-LTF. The thin arrows are the existing data subcarriers, for a total of 48. Dotted arrows are pilot subcarriers and there are a total of four. Thick line arrows are subcarriers for information notification and there are a total of four.

  As described in Non-Patent Document 3, the L-LTF of the PHY preamble portion performs frequency offset estimation using a known signal. In the present invention, channel information received by the N-STA simultaneously with this frequency offset estimation. Read the temporary primary channel that is notified. In the L-STA standard, since a subcarrier for information notification newly established in this L-LTF is not prepared, an N-STA that confirms the presence of the subcarrier receives an L-SIG on the primary channel. Alternatively, the channel may be switched to the temporary primary channel notified by the subcarrier during that period without performing demodulation.

  The N-STA reads an information notification subcarrier from the L-LTF that forms the PHY preamble portion of the radio frame 50 of the primary channel, and switches the received channel from the primary channel to the temporary primary channel. Then, in the temporary primary channel of the radio frame 51 for N-STA, the channel information notified by the high-function SIG-A is read out of the high-efficiency preamble portion for N-STA, and N-STA The transmission data is received by switching to the channel that receives the addressed radio frame.

  The frame format of the N-STA radio frame 51 will be described below with reference to FIG. A high-efficiency preamble portion for N-STA follows the L-STF, L-LTF, and L-SIG, which are PHY preamble portions of the radio frame 51. The high-efficiency preamble portion for N-STA is composed of high-efficiency SIG-A, high-efficiency SIG-B, high-efficiency STF, and high-efficiency LTF.

  The high-efficiency SIG-A is a field including frame information that is common to both cases of simultaneous transmission to a plurality of N-STAs and transmission to a single N-STA. The high-efficiency SIG-A is duplicated over the entire bandwidth for each subchannel with a 20 MHz bandwidth. The frame information included in the high efficiency SIG-A is, for example, the channel bandwidth of the N-STA frame. The N-STA that demodulates the radio frame knows the band to be demodulated by referring to the high-efficiency SIG-A on the temporary primary channel, which is the subchannel indicated by the information notification subcarrier. Can do. Further, the high-efficiency SIG-A includes MCS information of the high-efficiency SIG-B and the number of OFDM symbols when the high-efficiency SIG-B follows.

  A high efficiency SIG-B following the high efficiency SIG-A shows a resource arrangement when performing simultaneous transmission to a plurality of N-STAs by frequency multiplexing or spatial multiplexing. The N-STA to be demodulated can know the arrangement of the frequency resources of the data signal to be demodulated by the own station with reference to the terminal address or AID or GID (Group ID) indicated in the field. The high-efficiency SIG-B is transmitted using the entire bandwidth indicated by the high-efficiency SIG-A. Here, the entire 80 MHz bandwidth is modulated to be one field.

  Further, following the high-efficiency SIG-B, there are fields of a high-efficiency STF and a high-efficiency LTF, which are training signals for N-STA frames. Following the training signal, it becomes a radio frame addressed to a plurality of N-STAs. Note that these fields may be repeated on a plurality of time axes as necessary to increase delay tolerance from the situation of the propagation path or the like, or for training of spatial multiplexing.

FIG. 11 shows an example 2-2 of simultaneous transmission control in the wireless communication system of the present invention.
The high-efficiency SIG-B of Example 2-1 was transmitted in one field using the entire 80 MHz bandwidth, but in the case of Example 2-2, the fields are lined up for every 20 MHz bandwidth. SIG-B1 to high efficiency SIG-B4. These have the same symbol length in the same format, but their contents are different.

FIG. 12 and FIG. 13 show Example 2-3 and Example 2-4 of simultaneous transmission control in the wireless communication system of the present invention.
Example 2-3 and Example 2-4 are the same as Example 2-1 shown in FIG. 9 and Example 2-2 shown in FIG. 11, but after the high-efficiency STF and high-efficiency LTF, further frequency multiplexing and spatial multiplexing. It is an example of the frame format in which the high efficiency SIG-C including the information regarding transmission is included. Note that these fields may be repeated on a plurality of time axes as necessary to increase delay tolerance from the situation of the propagation path or the like, or for training of spatial multiplexing.

FIG. 14 shows Example 2-5 of simultaneous transmission control in the wireless communication system of the present invention.
Example 2-5 shows an example of a frame format when transmitting to a single N-STA using the N-STA frame format. The high-efficiency SIG-B including information for simultaneous transmission to a plurality of N-STAs is not included, and the high-efficiency SIG-A including common information is followed by a high-efficiency STF and a high-efficiency LTF. Note that these fields may be repeated on a plurality of time axes as necessary to increase delay tolerance from the situation of the propagation path or the like, or for training of spatial multiplexing.

  In Examples 2-1 to 2-5 described above, as shown in FIG. 15, a channel adjacent to the primary channel may be vacated as a guard band. However, a guard band other than the data portion is not essential. For example, as shown in FIG. 16, a guard band may not be opened in the preamble portion, but a guard band may be opened only in the portion of the radio frame addressed to the N-STA. Alternatively, a guard band may be provided in the N-STA preamble portion and the portion of the radio frame addressed to N-STA.

  By the way, in Example 1, although the example which notifies the frequency resource which receives the flame | frame addressed to several N-STA by MC was shown, in order to notify the frequency resource information allocated to each N-STA in MC, it implemented. A temporary primary channel for receiving the high-efficiency preamble portion for N-STA described in Example 2 may be designated. In this case, each N-STA reads the temporary primary channel from the MC of the primary channel and switches to the temporary primary channel. As in the second embodiment, the channel information received by the N-STA is read from the high-efficiency preamble portion for the temporary primary channel N-STA, and the channel is switched to the channel that receives the radio frame addressed to each N-STA. Perform reception processing.

FIG. 17 shows BA transmission procedure example 1 in the wireless communication system of the present invention.
In FIG. 17, as described in the second embodiment, the AP transmits data frames using channels assigned to N-STA and L-STA, respectively. However, the channel allocated to the N-STA is notified in, for example, the high function SIG-A among the high function preamble parts for the N-STA of the temporary primary channel of the frame, and the N-STA is notified of the high function SIG- Read A and switch reception channel to receive. N-STA and L-STA return BA after the SIFS time elapses on the channel that received the data frame after completing the reception of the data frame.

FIG. 18 shows a BA transmission procedure example 2 in the wireless communication system of the present invention.
In FIG. 18, the AP transmits a data frame on a channel assigned to each of the N-STA and the L-STA, and receives a BA returned on the channel that transmitted the data frame from the L-STA. Next, the AP transmits a block ACK request (hereinafter referred to as “BAR”) to the N-STA using the channel used for transmitting the data frame. Each N-STA that has received the BAR returns a BA on the same received channel.

  At this time, in order to prevent other channel interruptions, a BAR addressed to the N-STA may be transmitted even in a channel and a guard band that are not used for the N-STA. The same applies to the BA, and when the N-STA returns the BA on the channel that has received the data frame and BAR addressed to itself, the N-STA also transmits the BA in the channel and guard band that are not used for the N-STA. Also good. However, the guard band may be left open.

  Further, when transmission is performed using FDMA or FDMA and MU-MIMO in a frequency band in which the number of N-STAs is large and the AP is smaller than a unit of 20 MHz, the exchange of BAR / BA may be repeated a plurality of times.

FIG. 19 shows a BA transmission procedure example 3 in the wireless communication system of the present invention.
In FIG. 19, the AP transmits a data frame on a channel assigned to each of the N-STA and the L-STA, and receives a BA returned on the channel (for example, primary channel) that transmitted the data frame from the L-STA. Next, the AP transmits a wideband multi-user BAR (hereinafter referred to as “MU-BAR”) covering all channels to the N-STA. In the MU-BAR, the address of the N-STA that requests the AP to transmit BA and the frequency resource information for BA transmission allocated to each N-STA are described. This BA transmission frequency resource can be set independently of the channel through which each N-STA transmits a data frame. The MU-BAR also has a trigger frame function that synchronizes the BA timing transmitted by each N-STA.

  The N-STA that has received the MU-BAR checks whether or not the local station is designated as the destination, and if so, recognizes the channel on which the local station transmits the BA from the allocated frequency resource. . Further, timing and frequency synchronization are performed from the MU-BAR signal, and the BA is transmitted on the designated channel after SIFS after completion of reception.

  The BA may be transmitted, for example, on a 20 MHz unit channel, or may be transmitted simultaneously on another channel in order to prevent interruption from other STAs. Further, if necessary, interference between BAs may be suppressed by providing a guard band between BAs transmitted by each N-STA. In addition, when transmission is performed using FDMA or FDMA and MU-MIMO in a frequency band where the number of N-STAs is large and the AP is smaller than a unit of 20 MHz, the exchange of MU-BAR / BA may be repeated a plurality of times. Good.

FIG. 20 shows a BA transmission procedure example 4 in the wireless communication system of the present invention.
In FIG. 20, the process up to the point where the AP transmits the MU-BAR to the N-STA is the same as the BA transmission procedure example 3 shown in FIG.

  The N-STA that has received the MU-BAR checks whether or not the local station is designated as the destination, and if so, recognizes the channel on which the local station transmits the BA from the allocated frequency resource. . Further, timing and frequency synchronization are performed from the MU-BAR signal, and a multi-user BA (hereinafter referred to as “MU-BA”) is transmitted through a channel designated after SIFS after completion of reception.

  The MU-BA transmitted by each N-STA uses the same frame format as the frame format addressed to the N-STA shown in the second embodiment, and the L-STF to high-efficiency SIG-A, which is a common preamble part, has both time and frequency. After the transmission, the BA information is transmitted using the frequency resource allocated to each N-STA.

AP Wireless LAN base station device STA Wireless LAN terminal device L-STA Conventional standard terminal N-STA New standard terminal 50 Conventional standard STA frame 51 to 57 New standard STA frame

It is a figure which shows the structural example of the radio | wireless communications system of this invention. It is a figure which shows the structural example of the new specification STA. It is a figure which shows Example 1-1 of simultaneous transmission control in the radio | wireless communications system of this invention. It is a figure which shows Example 1-2 of simultaneous transmission control in the radio | wireless communications system of this invention. It is a figure which shows Example 1-3 of the simultaneous transmission control in the radio | wireless communications system of this invention. It is a figure which shows Example 1-4 of simultaneous transmission control in the radio | wireless communications system of this invention. It is a figure which shows Example 1-5 of simultaneous transmission control in the radio | wireless communications system of this invention. It is a figure which shows the example of a frame format of a multi-channel notification frame (MC I ). It is a figure which shows Example 2-1 of simultaneous transmission control in the radio | wireless communications system of this invention. FIG. 10 is a diagram illustrating an example of subcarrier arrangement of L-LTF in the second embodiment. It is a figure which shows Example 2-2 of simultaneous transmission control in the radio | wireless communications system of this invention. It is a figure which shows Example 2-3 of simultaneous transmission control in the radio | wireless communications system of this invention. It is a figure which shows Example 2-4 of simultaneous transmission control in the radio | wireless communications system of this invention. It is a figure which shows Example 2-5 of simultaneous transmission control in the radio | wireless communications system of this invention. It is a figure which shows Example 2-6 of simultaneous transmission control in the radio | wireless communications system of this invention. It is a figure which shows Example 2-7 of simultaneous transmission control in the radio | wireless communications system of this invention. It is a figure which shows BA transmission procedure example 1 in the radio | wireless communications system of this invention. It is a figure which shows BA transmission procedure example 2 in the radio | wireless communications system of this invention. It is a figure which shows BA transmission procedure example 3 in the radio | wireless communications system of this invention. It is a figure which shows BA transmission procedure example 4 in the radio | wireless communications system of this invention. It is a figure which shows an example of a primary channel and a secondary channel. It is a figure which shows the example which performs simultaneous transmission from AP to several STA by FDMA.

Example 1
FIG. 3 shows Example 1-1 of simultaneous transmission control in the wireless communication system of the present invention. The new standard STA is denoted as N-STA, and the conventional standard STA is denoted as L-STA.
In FIG. 3, it is assumed that the AP performs simultaneous transmission by FDMA with the L-STA of the conventional standards IEEE802.11a, 11n, and 11ac and the N-STA1 and N-STA2 of the new standard IEEE802.11ax as destinations. Prior to simultaneous transmission of data frames by FDMA, the AP uses a primary channel common to L-STA and N-STA and uses a multi-channel notification frame (hereinafter, referred to as a frame format that can be demodulated by N-STA1 and N-STA2). to send a) referred to as "MC I".

AP, to the N-STA1 and N-STA2, and notifies the frequency resource to receive the data frame following the later by MC I. For example, since always use the primary channel to transmit data frames in the L-STA, frequency resources N-STA1, N-STA2 is notified by the MC I has a band other than the secondary channel using the primary channel and L-STA Become. The frequency resource used for transmitting the data frames of N-STA1 and N-STA2 may designate channels of 20, 40, 80, and 160 MHz combined with subchannels in units of 20 MHz. It may not be in units of 20 MHz. Details of the frame format of the data frames of N-STA1 and N-STA2 will be described in Example 2 described later.

Further, MC I to be transmitted using the primary channel may be of L-STA is capable of receiving. The frequency resources used by N-STA1 and N-STA2 are not necessary for L-STA. For example, if the information of the duration field can be demodulated, the period required for simultaneous transmission set therein is set as a transmission prohibition period NAV. It may be set.

Further, MC I to be transmitted using the primary channel, as shown in FIG. 4, and Duplicate on the secondary channel (side by side) transmits, may be prevented channel interrupt as a broadband radio frame. However, N-STA1, N-STA2 does not demodulate the MC I on the secondary channel.

Further, as shown in FIGS. 3 and 4, a channel adjacent to the primary channel may be opened as a guard band. The guard band is a band that avoids interference between frames transmitted by frequency multiplexing, and the bandwidth may be changed according to the frame error occurrence rate exerted by the amount of interference. In addition, the guard band may be secured over the entire frame time length, but the data portion other than the data portion is not essential. For example, it may not be provided in the PHY preamble portion. Accordingly, when the L-STA and N-STA receives the MC I and data frames of the primary channel narrowband filter characteristics, it is possible to suppress the influence of the coupling loop interference from adjacent channels.

Further, with respect to N-STA1, N-STA2 from AP, after the notification of the information of frequency resources used in simultaneous transmission by MC I, as shown in FIG. 5, RTS / CTS using the primary channel as a hidden terminal measures The frame may be exchanged. For example, as the timeout time until simultaneous transmission is performed by the channel information shown in MC I, by setting the time including RTS / CTS frame exchange time, the data frame transmitted immediately after MC I send Even without this, it is possible to notify the channel arrangement.

In Figure 5, an example in which the AP following the MC I for notifying information of a frequency resource used by the N-STA1, N-STA2, replacing the RTS / CTS frame. Here, instead of the MC I and RTS / CTS frames, the replacement of the MU-RTS and CTS frames having the function of MC I, it will be described with reference to FIGS.

FIG. 8 shows a frame format example of the multi-channel notification frame (MC I ). The same applies to the MU-RTS frame. For example, a trigger frame format proposed as a new standard IEEE802.11ax can be used.
In FIG. 8, MC I may be any frame format that can be demodulated by the N-STA, similar frame control field and the normal MAC frame, a duration field, RA (destination address) field, TA (source address) field , Frame body field, and FCS field.

By the way, in Example 1, although the example which notifies the frequency resource which receives the flame | frame addressed to several N-STA by MC I was shown, in order to notify the frequency resource information allocated to each N-STA in MC I A temporary primary channel for receiving the high-efficiency preamble portion for N-STA described in the second embodiment may be designated. In this case, the N-STA reads the temporary primary channel from MC I of the primary channel, switch to that temporary primary channel. As in the second embodiment, the channel information received by the N-STA is read from the high-efficiency preamble portion for the temporary primary channel N-STA, and the channel is switched to the channel that receives the radio frame addressed to each N-STA. Perform reception processing.

Claims (16)

A wireless LAN base station apparatus (hereinafter referred to as “AP”) and a plurality of wireless LAN terminal apparatuses (hereinafter referred to as “STA”) are connected, and a wireless frame addressed to each STA is simultaneously transmitted from the AP by a frequency division multiple access method. In a wireless communication system,
The AP is
Control frame transmitting means for generating a control frame having information on frequency resources allocated to each STA, and transmitting the control frame in a primary channel shared by the STAs;
Radio frame transmitting means for simultaneously transmitting radio frames addressed to the STAs using frequency resources respectively allocated to the STAs;
The STA includes a frequency resource selection receiving unit that receives the control frame on the primary channel and receives a radio frame addressed to the local station using the frequency resource notified by the control frame. . A wireless LAN base station apparatus (hereinafter referred to as “AP”) and a plurality of wireless LAN terminal apparatuses (hereinafter referred to as “STA”) are connected, and a wireless frame addressed to each STA is simultaneously transmitted from the AP by a frequency division multiple access method. In a wireless communication system,
The AP is
Control frame transmitting means for generating a control frame having subchannel information for each STA to receive the high-efficiency preamble portion of the radio frame and transmitting the control frame on a primary channel shared by the STAs When,
Radio frame transmitting means for setting information on frequency resources allocated to each STA in the high-efficiency preamble section, and simultaneously transmitting radio frames addressed to the STAs using the frequency resources allocated to the STAs, respectively.
The STA receives the control frame on the primary channel, switches to the subchannel notified by the control frame, demodulates the high-efficiency preamble portion of the radio frame, and is notified by the high-efficiency preamble portion A radio communication system comprising frequency resource selection / reception means for receiving a radio frame addressed to the own station using frequency resources. A wireless LAN base station apparatus (hereinafter referred to as “AP”) and a plurality of wireless LAN terminal apparatuses (hereinafter referred to as “STA”) are connected, and a wireless frame addressed to each STA is simultaneously transmitted from the AP by a frequency division multiple access method. In a wireless communication system,
The AP is
A subcarrier for information notification different from a specified subcarrier is added to a PHY preamble portion of a radio frame of a primary channel that is commonly used by each STA, and each STA is configured to transmit the information by using the subcarrier for information notification. Subcarrier information notifying means for notifying information of a subchannel for receiving a high-efficiency preamble portion of a radio frame;
Radio frame transmitting means for setting information on frequency resources allocated to each STA in the high-efficiency preamble section, and simultaneously transmitting radio frames addressed to the STAs using the frequency resources allocated to the STAs, respectively.
The STA detects a subcarrier for information notification in a PHY preamble portion of the radio frame on the primary channel, and switches to the subchannel notified by the subcarrier for information notification to switch the high efficiency of the radio frame. A radio communication system comprising frequency resource selection / reception means for demodulating a preamble section and receiving a radio frame addressed to the own station using the frequency resource notified by the high-efficiency preamble section. The wireless communication system according to claim 3,
The PHY preamble section is composed of conventional L-STF, L-LTF, and L-SIG, and the information notification subcarrier is added to at least one of the fields. . The wireless communication system according to claim 2 or claim 3,
The high-efficiency preamble portion of the radio frame is allocated to each STA that is simultaneously transmitted by frequency multiplexing or spatial multiplexing with a first high-efficiency preamble used for notification of a band in which each STA demodulates the radio frame. A second high-efficiency preamble used for notification of the frequency resource arrangement,
The wireless communication system, wherein the second high-efficiency preamble is transmitted with the bandwidth of the subchannel or the entire bandwidth used for transmitting the wireless frame. A wireless LAN base station apparatus (hereinafter referred to as “AP”) and a plurality of wireless LAN terminal apparatuses (hereinafter referred to as “STA”) are connected, and a wireless frame addressed to each STA is simultaneously transmitted from the AP by a frequency division multiple access method. In the wireless communication method,
The AP is
A control frame transmission step of generating a control frame having information on frequency resources allocated to each STA, and transmitting the control frame on a primary channel shared by the STAs;
A radio frame transmitting step of simultaneously transmitting radio frames addressed to the STAs using frequency resources respectively allocated to the STAs;
The radio communication method according to claim 1, wherein the STA includes a frequency resource selection reception step of receiving the control frame on the primary channel and receiving a radio frame addressed to the local station using the frequency resource notified by the control frame. A wireless LAN base station apparatus (hereinafter referred to as “AP”) and a plurality of wireless LAN terminal apparatuses (hereinafter referred to as “STA”) are connected, and a wireless frame addressed to each STA is simultaneously transmitted from the AP by a frequency division multiple access method. In the wireless communication method,
The AP is
A control frame transmission step of generating a control frame having subchannel information for each STA to receive a high-efficiency preamble portion of the radio frame and transmitting the control frame on a primary channel shared by the STAs When,
A radio frame transmitting step of setting information on frequency resources allocated to each STA in the high-efficiency preamble section and simultaneously transmitting radio frames addressed to the STAs using the frequency resources allocated to the STAs, respectively. ,
The STA receives the control frame on the primary channel, switches to the subchannel notified by the control frame, demodulates the high-efficiency preamble portion of the radio frame, and is notified by the high-efficiency preamble portion A radio communication method comprising: a frequency resource selection reception step of receiving a radio frame addressed to the own station by using a frequency resource. A wireless LAN base station apparatus (hereinafter referred to as “AP”) and a plurality of wireless LAN terminal apparatuses (hereinafter referred to as “STA”) are connected, and a wireless frame addressed to each STA is simultaneously transmitted from the AP by a frequency division multiple access method. In the wireless communication method,
The AP is
A subcarrier for information notification different from a specified subcarrier is added to a PHY preamble portion of a radio frame of a primary channel that is commonly used by each STA, and each STA is configured to transmit the information by using the subcarrier for information notification. A subcarrier information notification step for notifying information of a subchannel for receiving a high-efficiency preamble portion of a radio frame;
A radio frame transmitting step of setting information on frequency resources allocated to each STA in the high-efficiency preamble section and simultaneously transmitting radio frames addressed to the STAs using the frequency resources allocated to the STAs, respectively. ,
The STA detects a subcarrier for information notification in a PHY preamble portion of the radio frame on the primary channel, and switches to the subchannel notified by the subcarrier for information notification to switch the high efficiency of the radio frame. A radio communication method, comprising: a frequency resource selection reception step of demodulating a preamble portion and receiving a radio frame addressed to the own station by using the frequency resource notified by the high efficiency preamble portion. The wireless communication method according to claim 8, wherein
The PHY preamble section is composed of conventional L-STF, L-LTF, and L-SIG, and the information notification subcarrier is added to at least one of the fields. . In the wireless communication method according to claim 7 or 8,
The high-efficiency preamble portion of the radio frame is allocated to each STA that is simultaneously transmitted by frequency multiplexing or spatial multiplexing with a first high-efficiency preamble used for notification of a band in which each STA demodulates the radio frame. A second high-efficiency preamble used for notification of the frequency resource arrangement,
The second high-efficiency preamble is transmitted with the bandwidth of the subchannel or the entire bandwidth used for transmission of the radio frame. Wireless LAN base station apparatus of a wireless communication system in which a wireless LAN base station apparatus and a plurality of wireless LAN terminal apparatuses (hereinafter referred to as “STAs”) are connected and different wireless frames addressed to each STA are simultaneously transmitted by a frequency division multiple access method In
Control frame transmitting means for generating a control frame having information on frequency resources allocated to each STA, and transmitting the control frame in a primary channel shared by the STAs;
A wireless LAN base station apparatus comprising: radio frame transmitting means for simultaneously transmitting radio frames addressed to the STAs using frequency resources respectively allocated to the STAs. In a wireless LAN base station apparatus of a wireless communication system in which a wireless LAN base station apparatus and a plurality of wireless LAN terminal apparatuses (hereinafter referred to as “STAs”) are connected and different wireless frames addressed to each STA are transmitted by a frequency division multiple access method. ,
Control frame transmitting means for generating a control frame having subchannel information for each STA to receive the high-efficiency preamble portion of the radio frame and transmitting the control frame on a primary channel shared by the STAs When,
Radio frame transmitting means configured to set frequency resource information allocated to each STA in the high-efficiency preamble section and simultaneously transmit radio frames addressed to the STAs using the frequency resources allocated to the STAs, respectively. A wireless LAN base station apparatus. In a wireless LAN base station apparatus of a wireless communication system in which a wireless LAN base station apparatus and a plurality of wireless LAN terminal apparatuses (hereinafter referred to as “STAs”) are connected and different wireless frames addressed to each STA are transmitted by a frequency division multiple access method. ,
A subcarrier for information notification different from a specified subcarrier is added to a PHY preamble portion of a radio frame of a primary channel that is commonly used by each STA, and each STA is configured to transmit the information by using the subcarrier for information notification. Subcarrier information notifying means for notifying information of a subchannel for receiving a high-efficiency preamble portion of a radio frame;
Radio frame transmitting means configured to set frequency resource information allocated to each STA in the high-efficiency preamble section and simultaneously transmit radio frames addressed to the STAs using the frequency resources allocated to the STAs, respectively. A wireless LAN base station apparatus. A wireless communication system in which a wireless LAN base station apparatus (hereinafter referred to as “AP”) and a plurality of wireless LAN terminal apparatuses are connected, and different wireless frames addressed to each wireless LAN terminal apparatus are simultaneously transmitted from the AP by a frequency division multiple access method. In a wireless LAN terminal device,
Frequency resource selection / reception means for receiving a control frame transmitted by the AP on a primary channel commonly used by each wireless LAN terminal device and receiving a radio frame addressed to the own station using the frequency resource notified by the control frame. A wireless LAN terminal device comprising: A wireless communication system in which a wireless LAN base station apparatus (hereinafter referred to as “AP”) and a plurality of wireless LAN terminal apparatuses are connected, and different wireless frames addressed to each wireless LAN terminal apparatus are simultaneously transmitted from the AP by a frequency division multiple access method. In a wireless LAN terminal device,
Receiving a control frame transmitted by the AP on a primary channel commonly used by the wireless LAN terminal apparatuses, switching to a subchannel notified by the control frame, and demodulating a high-efficiency preamble portion of the wireless frame; A wireless LAN terminal device comprising frequency resource selection / reception means for receiving a radio frame addressed to the own station using the frequency resource notified by the high-efficiency preamble unit. A wireless communication system in which a wireless LAN base station apparatus (hereinafter referred to as “AP”) and a plurality of wireless LAN terminal apparatuses are connected, and different wireless frames addressed to each wireless LAN terminal apparatus are simultaneously transmitted from the AP by a frequency division multiple access method. In a wireless LAN terminal device,
The subchannel for detecting information in the PHY preamble portion of the radio frame transmitted by the AP on the primary channel commonly used by the wireless LAN terminal devices is detected by the subcarrier for information notification. And a radio frequency resource selection / reception means for demodulating a high efficiency preamble portion of the radio frame and receiving a radio frame addressed to the local station using the frequency resource notified by the high efficiency preamble portion. LAN terminal device.

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